It looks like the folks on the Twitter API team have built their own URL shortener and will soon wrap all URLs to protect against fishing and collect stats:
Additionally, as we mentioned at our Chirp developer conference in April, if you want to share a link through Twitter, there currently isn’t a way to automatically shorten it and we want to fix this. It should be easy for people to share shortened links from the Tweet box on Twitter.com.
To meet both of these goals, we’re taking …

Pivotal Tracker does one thing: It Rocks. Last year when Morgan introduced me to this agile project management system, I was blown away. It’s a testament to the philosophy of “Do one single thing, and do it really freakin’ well.”
Now, they’ve gotten better with the release of version 3 of their API:
This Pivotal Tracker update allows you to see GitHub or other SCM commits in your stories, your project activity in your team’s Campfire chat room, and introduces the first wave of integrations with other bug/issue tracking applications including JIRA, …

Over the past week, I’ve been building a somewhat comical, if complex, application in Rails. It’s a “contextual game” that’s still a bit secret (only because it’s still in very early development and pretty much always borked.)
Today, while exploring the Twitter API and building out a more complex user model, I found an interesting attribute called “contributors_enabled” that was set to false in my user account. I immediately got excited, because this could only mean one thing: Delegation.